Wall Street stock indexes opened lower, putting them on track for weekly losses amid fears of war in Ukraine. Here’s what we’re watching in Friday’s trading:

• Streaming TV company Roku topped expectations with its latest earnings and revenue figures but came up short with its outlook for the current quarter.

• Digital sports entertainment and gaming company DraftKings  reported a quarterly loss that widened from a year ago.
• Cognex reported a strong fourth-quarter financial performance that drove the company to a record year with more than $1 billion in revenue.
• Cloud-software company Dropbox reported quarterly results above Wall Street forecasts as it topped $2 billion in annual sales.
• Shake Shack said inflation hurt its business in the recent quarter, as did more investment expenses.
• DuPont said it would sell a majority of its Mobility & Materials business for $11 billion in cash to Celanese .
• Deere  reported profit and sales for the recent quarter that beat expectations.

Chart of the Day

• It is time to start contemplating how vast wealth created in cryptocurrencies filters through the rest of the economy, writes Heard on the Street columnist Telis Demos. 

Write to James Willhite at james.willhite@wsj.com